寄生虫在宿主体内寄生在一定的部位或组织。过去许多作者观察结果认为粪类圆线虫多局限于小肠上部。为了进一步说明这问题,作者使用2～3月龄的幼犬3只,皮下注射粪类圆线虫幼虫3,000条,感染2～3周后,在幼犬体内检查幼虫分布,在小肠上1/5左右的部位检出寄生的成虫占总虫数的82～92%。另5只犬进行胃肠吻合手术,使下段小肠与胃的大弯部吻合,同样进行感染与检查 Parasites in the host parasites in a certain part of the body or tissue. Many authors in the past observed that the stink bug is mostly confined to the upper part of the small intestine. To further illustrate this problem, the authors used 3 puppies 2-3 months old, subcutaneous injection of 500,000 round worm larvae, 2 to 3 weeks after infection, check the larvae in puppies vivo distribution in the small intestine 1/5 About the parasites detected around the parts of the total number of insects 82 to 92%. The other five dogs for gastrointestinal anastomosis surgery, so that the lower part of the small intestine and gastric curvature match, the same infection and inspection